我有一个DataContext
派生类,它有许多IDbSet
是基类的子类:
public class BaseClass
{
public int Id {get; set;}
public int Length {get; set;}
public int Height {get; set;}
}
public class Derived1 : BaseClass
{
public string SomeProperty {get; set}
}
public class Derived2 : BaseClass
{
public string SomeProperty {get; set}
}
public class Derived3 : BaseClass
{
public string SomeProperty {get; set}
}
public class Derived4 : BaseClass
{
public string SomeProperty {get; set}
}
public class MyContext : DbContext {
public IDbSet<Derived1> set1 {get; set;}
public IDbSet<Derived2> set2 {get; set;}
public IDbSet<Derived3> set3 {get; set;}
public IDbSet<Derived4> set4 {get; set;}
}
我实际上有更多的派生类和相应IDbSet
的 s,我想在 MyContext 类上使用反射并遍历它们以检索和检查基类上存在的属性,但是当我尝试强制转换时IDbSet
返回IDbSet<BaseClass>
null。
using (var db = new ValidationDataContext())
{
try
{
Type t = db.GetType();
if (t != null)
{
foreach (PropertyInfo prop in t.GetProperties())
{
var objects = (t.InvokeMember(prop.Name, BindingFlags.GetProperty, null, db, null));
var dbset = objects as IDbSet<BaseClass>;
if (dbset != null) //dbset is always null
{
dbset.Where(v => v.Length <= 0)
.ForEach(v => Debug.WriteLine("Bad Length"));
}
}
}
}
}
有没有办法做到这一点?